Btrfs: small fixes for find_lock_delalloc_range.

There is a 'finish_wait', but no 'prepare_to_wait' . So I think that
the 'prepare_to_wait' is missing. The second change is  according to
the name of variable.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 44be9cfd30ee..ff8881fb56d6 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -1044,6 +1044,8 @@ search_again:
                         if (state->state & EXTENT_LOCKED) {
                                 DEFINE_WAIT(wait);
                                 atomic_inc(&state->refs);
+                                prepare_to_wait(&state->wq, &wait,
+                                                TASK_UNINTERRUPTIBLE);
                                 write_unlock_irq(&tree->lock);
                                 schedule();
                                 write_lock_irq(&tree->lock);
@@ -1059,7 +1061,7 @@ search_again:
                 node = rb_next(node);
                 if (!node)
                         break;
-                total_bytes = state->end - state->start + 1;
+                total_bytes += state->end - state->start + 1;
                 if (total_bytes >= max_bytes)
                         break;
         }